feat: add an example return type to the Concatenate solution

[Andrew5057]

Existing solutions that omit the return type still succeed on the site; this just provides a more complete solution for users to read on their own time.

Summary by CodeRabbit

• Enhancements
  • Improved type information for transformed callables, preserving their parameter and return types.
  • Added a public callable interface describing transformed functions that accept a person and additional arguments.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 77001786-be6e-46b1-a3e7-362912dfaba8

📥 Commits

Reviewing files that changed from the base of the PR and between e085239 and 7bab700.

📒 Files selected for processing (1)

• challenges/extreme-concatenate/solution.py

Included review availability: Your plan includes up to 4 reviews per rolling hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The change adds a generic Transformed protocol and updates transform to return that protocol. The callable shape preserves the Person argument, trailing parameters, and return type.

Changes

Transform typing

Layer / File(s)	Summary
Typed transform result challenges/extreme-concatenate/solution.py	Adds the public generic Transformed callable protocol and annotates transform with Transformed[T, P].

Estimated code review effort: 2 (Simple) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 7bab7

This change adds a more complete example return type to the Concatenate solution without introducing an actionable merge-blocking risk; it is ready to merge after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: adding an example return type to the Concatenate solution.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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